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Literature summary for 4.2.1.9 extracted from

  • Altmiller, D.H.; Wagner, R.P.
    Purification and properties of dihydroxy acid dehydratase from soluble and mitochondrial fractions of Neurospora crassa (1970), Arch. Biochem. Biophys., 138, 160-170.
    View publication on PubMed

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.85
-
2,3-dihydroxyisovalerate mitochondrial enzyme Neurospora crassa
1.03
-
2,3-dihydroxyisovalerate supernatant enzyme Neurospora crassa
2.16
-
2,3-dihydroxy-3-methylpentanoate supernatant enzyme Neurospora crassa
2.21
-
2,3-dihydroxy-3-methylpentanoate mitochondrial enzyme Neurospora crassa

Localization

Localization Comment Organism GeneOntology No. Textmining

Organism

Organism UniProt Comment Textmining
Neurospora crassa
-
-
-

Purification (Commentary)

Purification (Comment) Organism
-
Neurospora crassa

Source Tissue

Source Tissue Comment Organism Textmining
mycelium
-
Neurospora crassa
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
2.15
-
-
Neurospora crassa

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
2,3-dihydroxy-3-methylbutanoate
-
Neurospora crassa 2-oxoisovalerate + H2O
-
?
2,3-dihydroxy-3-methylpentanoate
-
Neurospora crassa 3-methyl-2-oxopentanoate + H2O
-
?

Temperature Stability [°C]

Temperature Stability Minimum [°C] Temperature Stability Maximum [°C] Comment Organism
40
-
20 min, stable Neurospora crassa
45
-
20 min, about 5% loss of activity Neurospora crassa
50
-
20 min, about 25% loss of activity Neurospora crassa
55
-
20 min, about 55% loss of activity Neurospora crassa
60
-
20 min, complete loss of activity Neurospora crassa

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7.9
-
2,3-dihydroxy-3-methylpentanoate Neurospora crassa
8.2
-
2,3-dihydroxyisovalerate Neurospora crassa

pH Range

pH Minimum pH Maximum Comment Organism
7 9 pH 7.0: about 40% of maximal activity, pH 9.0: about 25% of maximal activity, 2,3-dihydroxyisovalerate Neurospora crassa
7.4 9 pH 7.4: about 40% of maximal activity, pH 9.0: about 70% of maximal activity, 2,3-dihydroxy-3-methylpentanoate Neurospora crassa